Strong coupling superconductivity at 8.4 K in an antiperovskite phosphide SrPt 3P

T. Takayama, K. Kuwano, D. Hirai, Y. Katsura, Ayako Yamamoto, H. Takagi

Research output: Contribution to journalArticle

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Abstract

We report the discovery of a family of ternary platinum phosphides APt 3P (A=Ca, Sr, and La), which crystallize in an antiperovskite-based structure closely related to that of the heavy fermion superconductor CePt 3Si. All three phosphides showed superconductivity at low temperatures and the highest critical temperature T c=8.4K was observed for SrPt 3P. The analysis of specific heat C(T) for SrPt 3P shows clear evidence for very strong coupling s-wave superconductivity with a large ratio between superconducting gap Δ 0 and T c, 2Δ 0/k BT c∼5, and the presence of low-energy phonons. The presence of multiple Fermi surface pockets was inferred from the nonlinear magnetic field dependence of Hall resistivity, which we argue might play a role in realizing the strong coupling of charge carriers with the low-lying phonons.

Original languageEnglish
Article number237001
JournalPhysical Review Letters
Volume108
Issue number23
DOIs
Publication statusPublished - 2012 Jun 8
Externally publishedYes

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phosphides
phonons
superconductivity
heavy fermion superconductors
Fermi surfaces
charge carriers
critical temperature
platinum
specific heat
electrical resistivity
magnetic fields
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Strong coupling superconductivity at 8.4 K in an antiperovskite phosphide SrPt 3P. / Takayama, T.; Kuwano, K.; Hirai, D.; Katsura, Y.; Yamamoto, Ayako; Takagi, H.

In: Physical Review Letters, Vol. 108, No. 23, 237001, 08.06.2012.

Research output: Contribution to journalArticle

Takayama, T. ; Kuwano, K. ; Hirai, D. ; Katsura, Y. ; Yamamoto, Ayako ; Takagi, H. / Strong coupling superconductivity at 8.4 K in an antiperovskite phosphide SrPt 3P. In: Physical Review Letters. 2012 ; Vol. 108, No. 23.
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